使用未知属性名解析JSON.NET中的JSON

Question

I have some JSON Data which looks like this:

{
   "response":{
   "_token":"StringValue",
   "code":"OK",
   "user":{
     "userid":"2630944",
     "firstname":"John",
     "lastname":"Doe",
     "reference":"999999999",
     "guid":"StringValue",
     "domainid":"99999",
     "username":"jdoe",
     "email":"jdoe@jdoe.edu",
     "passwordquestion":"",
     "flags":"0",
     "lastlogindate":"2013-02-05T17:54:06.31Z",
     "creationdate":"2011-04-15T14:40:07.22Z",
     "version":"3753",
     "data":{
       "aliasname":{
         "$value":"John Doe"
       },
       "smsaddress":{
         "$value":"5555555555@messaging.sprintpcs.com"
       },
       "blti":{
         "hideemail":"false",
         "hidefullname":"false"
       },
       "notify":{
         "grades":{
            "$value":"0"
          },
          "messages":{
            "$value":"1"
          }
       },
       "beta_component_courseplanexpress_1":{
         "$value":"true"
       }
    }
  }
}

I am using C# with JSON.NET to parse through the data. I've been able to sucessfully get data using this algorithm:

User MyUser = new User();
JToken data = JObject.Parse(json);
MyUser.FirstName = (string) data.SelectToken("response.user.firstname");
//The same for all the other properties.

The problem is with the data field. This field is based on user preferences mostly and data is only inserted as it is used. The fields are all custom and developers can put in as many as they want without restrictions. Essentially, it's all free form data. Also as you notice they can be nested really far with data.

I've tried to run:

MyUser.Data = JsonConvert.DeserializeObject<List<JToken>>((string) data.SelectToken("response.user.data");

which doesn't work.

How would you go about converting it to be used in a C# object?

Answer 1

Json.NET can actually parse to a dynamic if that is useful to you. Which means you can do something like.

dynamic parsedObject = JsonConvert.DeserializeObject("{ test: \"text-value\" }");

parsedObject["test"]; // "text-value"
parsedObject.test; // "text-value"
parsedObject.notHere; // null

Edit: might be more suitable for you to iterate the values if you don't know what you are looking for though.

dynamic parsedObject = JsonConvert.DeserializeObject("{ test: { inner: \"text-value\" } }");
foreach (dynamic entry in parsedObject)
{
    string name = entry.Name; // "test"
    dynamic value = entry.Value; // { inner: "text-value" }
}

Answer 2

You can access it via the JToken / JArray / JObject methods. For example, this will list all of the keys under the data:

public class StackOverflow_14714085
{
    const string JSON = @"{
                          ""response"": {
                            ""_token"": ""StringValue"",
                            ""code"": ""OK"",
                            ""user"": {
                              ""userid"": ""2630944"",
                              ""firstname"": ""John"",
                              ""lastname"": ""Doe"",
                              ""reference"": ""999999999"",
                              ""guid"": ""StringValue"",
                              ""domainid"": ""99999"",
                              ""username"": ""jdoe"",
                              ""email"": ""jdoe@jdoe.edu"",
                              ""passwordquestion"": """",
                              ""flags"": ""0"",
                              ""lastlogindate"": ""2013-02-05T17:54:06.31Z"",
                              ""creationdate"": ""2011-04-15T14:40:07.22Z"",
                              ""version"": ""3753"",
                              ""data"": {
                                ""aliasname"": {
                                  ""$value"": ""John Doe""
                                },
                                ""smsaddress"": {
                                  ""$value"": ""5555555555@messaging.sprintpcs.com""
                                },
                                ""blti"": {
                                  ""hideemail"": ""false"",
                                  ""hidefullname"": ""false""
                                },
                                ""notify"": {
                                  ""grades"": {
                                    ""$value"": ""0""
                                  },
                                  ""messages"": {
                                    ""$value"": ""1""
                                  }
                                },
                                ""beta_component_courseplanexpress_1"": {
                                  ""$value"": ""true""
                                }
                              }
                            }
                          }
                        }";

    public static void Test()
    {
        var jo = JObject.Parse(JSON);
        var data = (JObject)jo["response"]["user"]["data"];
        foreach (var item in data)
        {
            Console.WriteLine("{0}: {1}", item.Key, item.Value);
        }
    }
}